Thanks for the responses, everyone. They echo how I felt about the situation!
The company I reached out to was Schneider’s Saddlery; I’ve used their blankets for years with great success and love the fit and durability for my playful TBs. I’ve also never had an issue with the waterproofing–until I ordered their VTEK Armorflex Warrior/Stormshield Marathon lightweight blankets, which have 80gms of fill along the topline and are essentially sheets with no fill through the sides. I wasn’t thrilled to discover this design, since I am not a big fan of sheets and don’t typically expect them to stay super waterproof, but figured I would give it a try since their guarantees are so good. Well, first big storm, and my horse is wet on his sides but dry through the top. Ok, well, I’m not pleased and contact them–get a fantastic reply and they send another blanket promptly, saying this was considered a waterproofing failure. No kidding? I expect the second blanket to work better–nope, big storm we had in CA last week, horse is wet underneath the sheet part, dry underneath the fill. Mind you, these blankets are less than 6 months old and never seen a washing machine or even a hose. They lived in their packages inside until the rain started. Additionally, the horse in the medium weight of the same style and size that I ordered at the same time stayed totally dry through three days of unrelenting rain.
So at this point I resign myself to lightweights only being suitable for light rain/mild weather, and call to inquire about the Tekno-Fleece lined blanket, which is supposed to be comparable to a lightweight but hopefully the complete lining will help it stay drier. Then began the entire discussion where the CS rep essentially told me I was nuts for using these blankets for that long on pastured horses and “no breathable blanket will go hours without getting saturated.” This is a really sharp turn from the amazing customer service I’ve received from them in the past. As I mentioned in the original post, she had no response when I mentioned my medium weight SSTack blanket staying waterproof and dry for three days, or the fact that I have one of their 100gm EuroCut stormshield blankets from 2014 that has never been washed beyond a quick hose down, has sat out on fence posts during the summer, and just generally been through hell but STILL remained waterproof for several days when I had to swap it out because my brand new one was soaked! And my Shires blankets did just fine as well, keeping everyone dry and comfy for about a week straight of nasty weather.
I suspect I would be quite happy with the Tekno-Fleece blanket, but I’m so peeved they may have lost me as a customer. Her suggestion was to toss the nasty blanket in the washer and dryer to “revive” the waterproofing, and just have enough blankets to swap out, or to stall my horses. Um…NO!
Time to go see what other blankets Shires has on offer…